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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d6b25465369851d5e72098571d243c779e20eddf220bdb1315aeaceda31ca8' 
  AND token = 'uCVLi/nWe8fGtjSSwpzqCRfTa/G1/83mzYLG5aFJZ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}